Mon-Fri 8:00am to 4:00pm ET
Phone: 443-949-9842
Fax: 443-949-9863

Mail Us

sduffy@hdmechanical.net
eharley@hdmechanical.net
jkushner@hdmechanical.net

Address

7703 Crain Highway

Upper Marlboro, MD 20772

Clients

H&D’s Clients Include:

Biotech & Healthcare

Human Genomic Science
The Institute of Genomic Research
Southern Maryland Hospital
UM Prince Georges Hospital Center

Commercial

Amazon
Bank of America
The Coca-Cola Company
Covington & Burling Law Firm
KPMG
Winston & Strawn Law Firm

Data Centers

Equinix Data Center
Level 3 Data Center
NASD Data Center
Savvis Data Center
UNISYS Data Center
Multitude of Data Centers under Non-Disclosure Agreements

Entertainment & Hospitality

Equinox Fitness
The Maryland Stadium Authority
MGM National Harbor
Sport & Health Northwest
Washington Marriot Wardman Park

Public Government

Andrews Air Force Base
Architect of the Capital
Department of the Army (Corps of Engineers)
Fort Detrick
Fort Meade
Naval Air Station Patuxent River
NIST – National Institute of Standards & Technology
State of Maryland General Services Administration
United States Department of Agriculture
United States Naval Academy
United States Pentagon

Transportation

Baltimore Washington International Airport
Maryland Department of Transportation
Ronald Reagan Washington National Airport
Washington Dulles International Airport
Washington Metropolitan Area Transit Authority

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